As Super Tuesday Approaches, Trump Explains His KKK Comments05:48

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Republican presidential candidate Donald Trump speaks at a campaign rally at the Madison City Schools Stadium on February 28, 2016 in Madison, Alabama. Trump is in Alabama ahead of the Super Tuesday primaries March 1. (Scott Olson/Getty Images)This article is more than 3 years old.

The most important day of the presidential primary, Super Tuesday, is tomorrow. Thirteen states, as well as American Samoa and Democrats abroad, will cast their votes, with the potential for front-runners Hillary Clinton and Donald Trump to run away with their respective races.

NPR’s Ron Elving joins Here & Now's Robin Young to look at the biggest storylines heading into tomorrow, as well as Trump’s recent gaffe, in which he didn’t unequivocally denounce the Ku Klux Klan.